void main(){
  //比较类型：num、String、常量、对象、枚举
  //continue跳转标签
  String language = 'Java';
  switch (language) {
    X:
    case "Dart":
      print("Dart is My Favorite");
      break;
    case "Java":
      print("Java is My Favorite");
      continue X;//实现离开跳转到X的位置，再次去执行Dart语句
    default:
      print('None');
  }
}